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At least 199 records · Page 11Linked to original sources
PubMed1999

The cariostatic mechanism of fluoride.

The benefits of using fluoride to prevent caries have been known for many years, but a complete understanding of this mechanism is still being researched. The fluoride concentration in the apatitic structure of enamel does not have as significant an effect on reducing caries as a continuous presence of fluoride in the plaque liquid. Concentrated, topical fluoride agents (such as in toothpaste, fluoride mouth rinses, gels, or varnishes) have a different mechanism of fluoride protection than low-concentration applications (such as fluoridated water). In initial caries lesions and plaque, concentrated agents form globules of a calcium fluoride-like material on the enamel surface. This material is fairly insoluble, possibly because it is coated with phosphates or proteins. This mechanism explains how the topical application of a fluoride varnish, two or three times a year, can result in caries reduction.

Apatites↗
PubMed1999

The effect of orthodontic treatment on salivary flow, pH, buffer capacity, and levels of mutans streptococci and lactobacilli.

Fixed orthodontic treatment has been shown to cause an increased incidence of enamel demineralisation. The purpose of this study was to investigate the changes in stimulated salivary flow rate, pH, buffer capacity, and the levels of mutans streptococci (MS) and lactobacilli in patients undergoing therapy with fixed orthodontic appliances. Saliva samples, plaque index scores and dietary histories were taken from 21 sequential patients before the start of treatment, and one month and three months after placement of brackets and bands. There was a statistically significant increase in stimulated salivary flow rate, pH, buffer capacity, plaque index scores, and in the levels of MS and lactobacilli after three months of active treatment. It is postulated that the balance between the cariogenic challenge posed by high levels of MS and lactobacilli, and the reparative effects of concurrent increases in salivary flow rate, pH and buffer capacity, determines the likelihood of mineral loss or gain over time. A failure to follow basic preventive measures may increase the risk for some patients of enamel decalcification during orthodontic treatment with fixed appliances.

Adolescent↗
PubMedDate not supplied

Relating visual and radiographic ranked scoring systems for occlusal caries detection to histological and microbiological evidence.

This study compared a visual ranked scoring system and a radiographic ranked scoring system for occlusal caries detection with the level of infection of dentin. Seventy-five third-molars, designated for extraction, were professionally cleaned. Caries was scored according to a visual ranked scoring system at a selected site in the groove-fossa system. Radiographs of the teeth were available and caries was recorded along a five-point ranked scoring system. Each tooth was extracted and hemi-sectioned through the investigation site under aseptic conditions. A burful of dentin was removed from the EDJ of one of the section faces and these samples were processed to establish the level of dentin infection. The depth of the lesion was assessed on the other section face using a five-point ranked histological scoring system. A strong relationship was observed between the histological lesion depth and visual score (r(s)=0.93) while a moderate relationship was seen between lesion depth and radiographic scores (r(s)=0.77). The dentin from teeth with cavities exposing dentin was heavily infected. The dentin from teeth with microcavities or grey discoloration of the dentin was less infected than the lesions with frank cavitation (score 4) (p<0.05, t-test), but more infected than the initial lesions (p<0.05, t-test). The latter lesions showed minimal infection. A similar tendency was seen with respect to increasing radiographic scores and the level of infection of the dentin.

Colony Count, Microbial↗
PubMedDate not supplied

The etch-bleach-seal technique for managing stained enamel defects in young permanent incisors.

Hypomineralized enamel defects frequently are manifest as a mottled-white appearance and can be associated with variable degrees of discrete yellow-brown intrinsic staining. Numerous treatment approaches have been proposed, ranging from bleaching to enamel reduction to restorative techniques. Bleaching of hypomineralized enamel lesions, using 1 to 2 applications (10 to 15 minutes each) of 5% sodium hypochlorite, has been applied clinically. Treatment using this approach has proven successful in removing yellow-brown discolorations from lesions in young permanent teeth. Young permanent incisors with yellow-brown intrinsic discolorations can often be treated by a simple and conservative bleaching protocol using sodium hypochlorite.

Acid Etching, Dental↗
PubMed1997

The mechanism of fluoride protection.

Since the 1940s, researchers have understood the positive effect of fluoride on anticaries activity. Several studies, beginning with the Cheektowaga study, showed that an increased number of concentrated fluoride applications also have a beneficial effect on anticaries activity. In fact, the continuous presence of high-fluoride concentrations has a more significant protective effect than enamel fluoride. A high-potency dentifrice is the ideal form with which to produce protective effects. This article describes how high-fluoride concentrations affect dental caries.

Acidulated Phosphate Fluoride↗
PubMedDate not supplied

A paradigm shift in the treatment of caries.

This paper presents a shift in the paradigm for treating dental caries from a surgical to a medical approach. Two key points are essential to understanding caries. First, caries is a bacterial infection caused by specific bacteria. Second, before cavitation, caries is a reversible multifactoral process. Two features, caries activity and caries risk, provide a diagnosis and prognosis leading to a treatment plan. Patients receive treatment using a medical model consisting of four steps: bacterial control; reduction of risk levels for at-risk patients; reversal of active sites by remineralization; and follow-up and maintenance.

Anti-Infective Agents, Local↗
PubMed2002

[Paracervical non-caries defects].

The aim of the study was the description of origin and treatment of paracervical, non-caries defects. Dental plaque is involved in the formation of caries defects, while those of non-caries origin are produced due to the action of mechanical and chemical factors. The treatment consists in wide fluoride prophylaxis (elimination of causes) and in the application of mineralization procedures and restoration of missing dental tissue using modern dental highly-adhesive materials. At the same time occlusion disorders and parafunctions are eliminated.

Dental Prophylaxis↗
PubMed1992

Erosion.

With the current substantial decline in dental caries in adults, and increasing retention of teeth into old age, dental erosion is now being recognised as a major cause of tooth damage. It is easily recognised in its more advanced form, though more difficult to detect in its initial stages. Its mechanisms of action is generally not well understood. In this paper, current concepts of the chemistry of demineralisation of the mineral components of teeth are examined, with view to their providing a better understanding of some of the clinical characteristics of dental erosion of enamel. Categories and properties of potential erosive substances are reviewed. Speculation as to the potential effects of erosive substances on exposed root surfaces leads to consideration of the possible relationship between erosion and rapid caries development. The more commonly recommended mechanisms of control or prevention of erosion are described, and the rationale of their use analysed.

Dental Caries↗
PubMedDate not supplied

Orthodontic decalcification management with microabrasion.

Patient home care during orthodontic treatment is often less than ideal. For those patients who routinely let plaque accumulate around orthodontic appliances, there can be white or stained areas of decalcification around the bonded appliances. Management of this esthetic problem can be accomplished in several ways depending on the severity of the defect. This paper describes the very conservative technique of microabrasion which works well in removing superficial markings caused by decalcification. In a sample of 98 decalcified teeth from 20 patients with orthodontic decalcifications and various other unesthetic stains, microabrasion removed most or all of the disfiguring marks on 78.5 percent of the teeth evaluated. At least some improvement was noted 96.9 percent of the time. These results were statistically significant (P > .01). It seems appropriate to employ this technique prior to initiating more aggressive cosmetic dentistry such as resin bonding, Class V restorations, or labial veneers.

Dental Enamel↗
PubMedDate not supplied

Novel dental anomalies associated with congenital contractural arachnodactyly: a case report.

Congenital contractural arachnodactyly (CCA) is an inherited disorder of connective tissue similar to Marfan's syndrome. The craniofacial and oral features of a young girl with CCA are described. The patient has the typical features of CCA as well as some additional dental anomalies which have not previously been reported with this syndrome. These include banded pitted enamel hypoplasia and hypomineralization, long, spindly tapered roots, and pulp canal obliteration with multiple pulp stones. Dentists must be aware of the clinical features of a patient's syndrome to determine whether there are implications for dental treatment such as a need for antibiotic prophylaxis. It is important to exclude Marfan's syndrome as a differential diagnosis for CCA because the former has more associated complications and a less favorable prognosis.

Adolescent↗
PubMedDate not supplied

Prevalence of hidden caries.

Clinical evaluations of the first and second permanent molars were compared with radiographic evaluations of the same teeth, for 359 patients (between six and eighteen years old) of the pediatric department of the Academic Centre for Dentistry Amsterdam (ACTA). The teeth were professionally cleaned and dried before the clinical evaluation. Despite the thorough examination, taking into account the fact that all discolorations and/or decalcifications were noted, 15 percent of the teeth that did not show signs of enamel caries clinically, showed a dentine lesion on the bitewing radiograph. These 15 percent of teeth with hidden caries were found in 7.5 percent of the population studied. The absence of clinical signs of occlusal enamel caries or dentine caries does not guarantee a sound dentition. Sealant treatment of teeth that are sound (both clinically and radiographically) is justified, therefore, soon after tooth eruption.

Adolescent↗
PubMed1992

The effect of an experimental mouthrinse on enamel lesion remineralization in vitro.

This paper describes the effect of a 2 ppm fluoride containing, slightly acidic mouthrinse (pH = 6) on the remineralization of enamel lesions in vitro. The rinse was applied twice daily for 2 min, on about 85 microns in depth artificial lesions. Artificial enamel lesions were formed at pH = 5 in a 6% CMC gel. The lesions were subsequently remineralized in vitro in a neutral remineralizing solution (1.5 mM Ca and 0.9 mM phosphate) with or without the application of the rinse. After 3 weeks the samples were evaluated by means of quantitative microradiography. The results showed that a statistically significant reduction in lesion depth occurred of 48 and 29% with or without rinse application, with respect to the original lesion depth. The effect of the rinse compared with no rinse decreased the lesion depth by 40%. The data indicate that application of a slightly acidic rinse with 2 ppm fluoride applied twice a day, stimulates the remineralization at the lesion front and does not lead to blocking of enamel pores observed after acidic, high level F applications (APF).

Animals↗
PubMedDate not supplied

Dissolution of dental enamel in soft drinks.

A high percentage of the population consumes a variety of soft drinks on a daily basis. Many of these soft drinks contain sugar and various additives and have a low pH. This study compares enamel dissolution from both regular and diet beverages.

Adolescent↗
PubMed2004

Assessment of enamel erosion and protective effect of salivary pellicle by surface roughness analysis and scanning electron microscopy.

PURPOSE: To assess dental erosion caused by 0.1% and 1.0% citric acid in vitro and to estimate the protective influence of experimentally formed salivary pellicle. MATERIALS AND METHODS: Bovine enamel slabs (n = 80) were polished and embedded in epoxy resin. For the formation of pellicle layer 40 specimens were immersed for 24 h in pooled human saliva. Erosion was caused by immersion in citric acid solution for 1, 5, 10 and 30 min. Erosive alterations on the pellicle-covered and non-covered enamel specimens were scored as a change (delta) of surface roughness parameters Ra, Rt and RzDIN using contact profilometer and observed in scanning electron microscope. RESULTS: Profilometric analysis of eroded enamel specimens emphasized the aggressiveness of even low concentrated citric acid with a short period of challenge. The change of roughness parameters after 1-min immersion in 0.1% citric acid were 16.4, 182.6 and 132.2 nm for deltaRa, deltaRt and deltaRzDIN, respectively, and 54.8, 516.6 and 258.2 nm after 1-min immersion in 1.0% citric acid. Changes of the surface roughness were dependent on the exposure time and concentration of acidic solution. Pellicle layer significantly reduced the extent of erosive destruction, which was additionally documented on SEM-micrographs. Residual pellicle-like structures were detected after 5 min of immersion in 0.1% citric acid. However, there were no significant differences in pellicle-covered and non-covered enamel slabs measured profilometrically for 1.0% citric acid with 10 min and 30 min exposure time. CONCLUSION: The findings confirm the property of pellicle layer to resist against erosive influence of organic acids, which is, however, limited by duration of acidic treatment and concentration of erosive agent.

Animals↗
PubMedDate not supplied

Effects of sports drinks and other beverages on dental enamel.

A high percentage of people consume soft drinks that contain sugar or artificial sweeteners, flavorings, and various additives. The popularity of sports (energy) drinks is growing and this pilot study compares enamel dissolution in these and a variety of other beverages. Enamel blocks (approximately 7.0 x 5.0 x 2.5 mm) were sectioned from sound extracted human premolars and molars and measured, weighed, and immersed in the selected beverages for a total of 14 days. The pH of all beverages was measured. The enamel sections were weighed at regular intervals throughout the immersion period with the solutions being changed daily; all studies were performed in duplicate. The data were subjected to one-way ANOVA with post hoc Scheffe testing. Enamel dissolution occurred in all of the tested beverages, with far greater attack occurring in flavored and energy (sports) drinks than previously noted for water and cola drinks. No correlation was found between enamel dissolution and beverage pH. Non-cola drinks, commercial lemonades, and energy/sports drinks showed the most aggressive dissolution effect on dental enamel. Reduced residence times of beverages in the mouth by salivary clearance or rinsing would appear to be beneficial.

Analysis of Variance↗
PubMedDate not supplied

Morphology evaluation of primary enamel exposed to antihistamine and fluoride dentifrice--an in vitro study.

This in vitro study sought to evaluate the action of a pediatric medication with low pH and high acidity in primary enamel submitted (or not) to daily applications of fluoride dentifrice. For this study, 70 blocks of primary molars (n = 10 per subgroup) were analyzed using scanning electron microscopy. Six subgroups (two control and four experimental) were submitted to different treatments for 10 days. Microscopically, the enamel blocks of the subgroups that received medication and fluoride demonstrated the largest areas of partially or totally conditioned superficial enamel. The opposite was observed in the subgroups that were not exposed to fluoride; erosions in the internal enamel and in the transition zone between deep enamel and dentine showed superior percentiles. It was concluded that the medication modified the morphology of the primary enamel and that the use of fluoride was able to reduce the erosive effect of the formulation.

Cariostatic Agents↗
PubMedDate not supplied

[Evaluation of oral health in bulimia nervosa].

AIM: The aim of the study was to evaluate the dental status of bulimics with self inducing vomiting. METHOD: 33 bulimic female patients aged between 17 to 20, who were in need of hospitalization in the Department of Psychiatry, Poznań University of Medical Sciences, were compared to 31 age and sex matched healthy controls aged between 18 to 36. For each subject dental examination including calculation of caries, erosion and oral hygiene indexes: PlI, OHI-S, DMFT and TWI was performed. In both groups salivary flow and pH of the whole saliva were measured. RESULTS: Bulimics manifest a significantly higher retention of dental plaque and also higher frequency of enamel erosion, which were not present in the control group. Additionally, bulimics had more intense caries. Stimulated and resting salivary flow were poor, although they had the lowest pH values but were within the normal range. CONCLUSION: Patients with bulimia nervosa showed a higher number and severity of enamel erosion. There is also the high difference in amount of dental plaque, caries and changes in salivary secretion. These results highlight a need for close cooperation between the dentist and the patient's physician, which will then improve the diagnosis and treatment of this disease.

Adolescent↗